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Hey Jacek,
Not sure the cause of your problem but I would be concerned. The plant ran your DDP and CD through "Eclipse Image Verify" and it clearly indicates that the audio content is indeed different. The duration of the discrepancies (I'm guessing here) seems to last for the entire length of the track and does not resolve until the next track change. Compare the timings in the Eclipse log and see if they line-up with your CD track sheet.
When working with DDP file sets I find it best to generate and include md5 check-sum files. The plant can then verify that the DDP image is exactly the same as when you created the md5 files. This is an easy way to insure the data integrity of the DDP and an easy way to manage project archive verification.
Let us know what you find when you get your pre-masters back. Could have been a slight level change or dither setting? Good luck!
Tom "Curly" Ruff
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